PHOTOS: Season 2 of “Under the Dome” to premiere June 30 on CBS

“Under the Dome” is back with a new threat: just when things couldn’t look worse, the whole thing becomes magnetized. Clues to the origin of the Dome may be forthcoming. Meanwhile, bestselling author and executive producer Stephen King makes a cameo appearance. King, who penned the book the series is adapted from, also wrote the premiere episode. The second season premiere of the CBS thriller is June 30. Eddie Cahill and Karla Crome join the cast as series regulars.